409 Stainless Steel which is what the Magnaflow kit is made of will have surface rust, but not rust through.

304 Stainless its the best for an exhaust system.

The GXP W-Body frame is the same as the Monte/Impala. There is nothing different on that frame from the others. Now there might be other things that make the car ride/handle different but the W-Body Frame is the same.

 

I think im gonna try the aero turbine muffler/resonators.

 

10-4 on that. I'm 3" all the way back, Hogan Catless DP, magnaflow single chambers, you better bet I set of car alarms. It was worse with the Super44s.

 

I've got a 07 GPX that got fudge packed in the rear last week, Over $5,300.00 in damages. The cat back exhaust system was going to cost over $1,100.00
!!!!! Thank God for magnaflow.

 

The pipes will still get surface rust.

Why would the Imp not be stainless? More cost cutting?

 

Ok, questions, first, are we ABSOLUTELY sure that the '05 GXP exhaust is stainless? second, what size resonator should I buy if I want to put a new one on? I'm thinking about a shotgun res from SLP but I don't think they make them in a size to bolt up to our cars stock exhaust. Thanks guys.

 

As far as a resonator, get whatever fits the pipe size and match the length to the volume you want (longer generally being quiter etc).

 

Borla and bassani are the only brands that i know of use surgical 304 stainless all others use 409

 

is our resonator 2.5" or is it 2.25 like the rest of the system? Also, is our cat 2.5" or 2.25"?

 

Resonators are welded in the stock exhaust on the 2.5" I pipe.

 

SLP does aswell

 

i tried something i never heard of and put glaspacks on my impala ss and they sound amazing

 

If u leave the factory cats in and just through in a glass pack now days it really isnt loud like most people think. My brother done that to his dodge pickup

 

awesome, thanks nacho, I'm still not sure what I want to do with the resonator yet. I'm gonna get the mufflers installed and see how I like it first.

 

I just used a strait thru magnaflow muffler instead of a resonator. The 3” SLP loud mouth resonator I got was Just a 4” pipe necked down to 3 on the ends. When they say loud mouth they ant blowin smoke.

 

I have the magnaflow cat-back.....if I swap out the mufflers for flowmaster 40's....will I loss low end power? (BTW I still have res on the cat-back)

 

No the only way you would lose low end is with a 3' down pipe, and that is questionable.

 

But your gains up top are much better.

 

Thanks, I love the magnaflow, but its not loud...has anyone on here have a magnaflow cat back and swaped the mufflers for somthing else?

 

I don't think anyone has done that, because most people buy the MF set-up more for mellow, reserved tones.

I have 3" all the way back, !Res with a set of these, ready to replace my Super44s:

http://store.summitracing.com/partde...5&autoview=sku